Diagnostic instrument



1,559,558 Nov' 3 1925' l H. L. DE zENG- DIAGNos'lIc INSTRUMENT FiledFeb.4 15, 1923 Patented Nov. 3, 1925.

UNITED vsiA'rlas HENRY I.. DE ZENG, 0E Moo'REsTowN, .NEW JERSEY,ASsIGNoR To DE zENG STAND'- ARD COMPANY, 0E CAMDEN, NEW JERSEY, AconroaATIoN or NEWJERSEY.,

DIAGNOSTIC INSTRUMENT.

Application filed February 15, 1923. Serial No. 619,085/

To all whom t may concern:

Bc it known that l., HENRY L. DE ZENG, a: citizen of the United States,.residing at Moorestown, county of Burlington, State of New Jersey, haveinvented a new and useful Diagnostic Instrument, of which the follow!ing is a specification.

The primary object.` ofmy invention is to devise a diagnostic instrumentadapted to be employed for the examination of theeye or other parts ofthe body under predetermined iliumination, the character or nature ofwhich may loe varied.

A further object of the invention is to produce an instrument which willproduce illumination of predetermined character.

A further object of my invention is to devise a diagnostic. instrumentwhereinthe partsare'interchangeable, in order to vary the nature of Vthe4illumination derived from' it. Y

A further object ofthe invention is to de-A vise av handle forafdiagnostlic instrumenthaving an electric lamp and wherein novel meansare provided for controlling` the lamp circuit.

A further object is to provide a diagnostic instrument havinginterchangeable parts for not only altering the character ofillumination derived from Yit but for projecting' test objects upon theexternal and the in ternal parts of the eye or other object to beexamined.

Another object is to devise a diagnostic instrument which will enable 1thev operator to examine an eye generally and to measure it forrefractive errors `especially by .the use of both a general illumination`and a speciall illumination, the latter projecting a test object.

Other novel features of construction and advantage will hereinafter morefully appear in the detailed description and the appended claims.

AF or the purpose of illustrating my invention, I have shown in theaccompanying drawings embodiments thereof which are at present preferredby me, since these e1nbodiments will be found in practice togivesatisfactory andreliable results. It is, how? ever, to be understoodthat `the various instrumentalities of which my invention. consists canbe variously arranged and organized and that my invention is not limitedto the precise arrangement and organization of described.

these instrumentalities as herein .shown `and Figure.1-re`presents, inrear elevation, a diagnostic instrument, embodying my inven-v tlOIl.' pi* I. Y ;'y i Figure 2 represents, in rear eleva-tion, a portion ofthe'instrument.

Figure 8 represents a section on lline 3-3 of FigureV 1. i f,

`rigure 4 represents, in sectional elevatiofyjVv a portion of themechanism. v l 1 y r i-gure 5 represents, .in sectionalelevation, anovelv construction of an interchangeable nipple orcouplingemployed.

F'gure6 represents, in sectional elevation.

l another form of nipple or coupling which can be employed. p .j l. .fFigure 7 represents a plan 'View ofa testv object,which is adapted tobecarried` by the nipple.

Similar .numerals of reference` indicate correspondingparts.. v y iReferring to the drawings,

1 designates the body portionof a diagnosticinstrument, embodying myinvention. 2de`signates a conventional lens system employed ininstruments of this character. 3 designates a light tubewhichiiscarried'by the body portion 1; in; anyrdesired manner.` The light tube 3carries the'reflecting mirror 4 in the usual manner.

The light. tube' y is provided in the usual mani'ierwith alens V5' andat its lower end it is intern-ally threaded, asl at 6, in order toreceive the threaded.`

lportion 7 yo 'f a nipple or coupling 8.- This at its lower portion inorder tobe. received on the threaded portion 9 of the lamp Aholderl 10which carries the lamp 11..The lamp is electrically connected in theconventional'` .engagement withit an adjustablenut or sleeve 16 which ispr'ovidedwith a depending flange 17 adapted to contact with the cap 16in ordertoclose the circuit through y the lamp. v y It will now beunderstood that the nipple or couplingS, when in position, surrounds 9onipple orY coupling 8 is'internally threaded the lamp `11 andit isrprovided at its upper or outer end With a lens 17 and ii' desired witha screen 18 so that it employed the light will shinethrough both thescreen 18 and lthe lens 17. The relative'position or location o'i'thelens 17 andthe screen 18 may be reversed, if desired, in the nipple, asshown in Figure 6, or the screen may be omitted, asshown in `Figure 3.lt it is desired to vary the nature or the illumination, this can beemployed by changing the screenl 18. so that any desired nature orvcharacter 'o' illuinination'can be rvemployed by interchanging thenipples or couplings, it being understood that nipples are vprovidedhaving dinerent types or screens therein. The change in the illuminationmay also be accomplished by changingvthe screen in the nipple instead ofhaving separate Vinterchangeable nipples, as this will accomplish thesame purpose.

ADi'derent test objects such as, for example, that shown 'at 19, can beintroduced into a nipple either vvith or Without the screen 18 andeither With lor Without the lens 17. The relative location ot'thisscreen can'also be varied, and it can be placed anterior or posterior toVeither the lens or the screen, if it 'is employed. j

This test object'19 may be composedl or" translucent or transparentn'iaterialV with characters for thebstopp'a'ge or light or it may beopaque AWith xlight po'rts., The `circuit brealring'nut oi "sleeve'16preferably has a portion of its outer periphery knurled to 'facilitatelits manipulation, as indicated at 20. '21 'designates a sight opening.

yByfthev employment of 'an interchangeable nipple orcouplin'g orbyinterchanging the parts thereof, the nature or character of the lightprojected by the instrument may be varied in accordance withconditionsand requirements niet with :in practice.

nipples any required form or Villumination may be i-eadily interchangedby simply changing one nipple for another and, in a similar manneryanyldesired type ottest object may be employed and one interchanged 'foranother. I

'It having kquite recently been recognized that examination or the eyemade under the Y l VFurthermore, 'by the interchange of the tnipple orbreaking member 16 relatively to the 'handle 13. ln additiomthis form otcircuit breaker is positive i and contains no delicate'electricalconnections which 'frequently become inoperative and troublesome. 1t isalso very compact, symmetrical and not readily displaced either rom aposition of Contact or otherwise With the handle.

l1t will now be apparent that lhave de.

vised a new and useful diagnostic instrument Which embodies ythefeatures or advan tage enumerated as desirable in the statement of the;invention and the above description, and ivhilel have, vin 'the presentinstance, shown and described embodiments ther/zot whichare at presentVpreferred by me, and which Will give in practice satisfactory andreliable results. it is to be understood that these embodiments are'susceptible or modification in various particulars without departingfrom the spirit or scope or the "invention or sacrilicing any or itsVadvantages.

. Having thus described my invention, what I claim as new and desire tosecure by 'Letters Patent, is y V1. JIn a'diagnostic instrument, ahandle, "a source ot light, a-body portion having a sightopening, a'reflector adjacent Ato said si. u' opening, a casing in line with saidlight source and said reflector and connected with said body portion, acondensing lens in said casing and interchangeable 'couplings forconnecting said handle with' said casing, one or moreor saidcouplingscontaining different lightcon'trolling means.

2. 1n a device or the character described, a light Fpassage way, asource or lightportion, and a series or couplers,'each adapted todetachably unite the light passage Way and source or light portion and-a`different light controlling meinberin-each unit or the series.

S. In a'device oi the character described, a light passage Way, a sourceor light portion and a detachable -meniber connecting the light passageWay and the source or light portion, andan illuminatable ltesting devicemounted in the detachable 'memben #l-lENRY L. IDE 'ZENGL

